%0 Generic %1 kobayashi2014origin %A Kobayashi, Chiaki %A Ishigaki, Miho N. %A Tominaga, Nozomu %A Nomoto, Ken'ichi %D 2014 %K metallicity star yields %T The origin of low alpha/Fe ratios in extremely metal-poor stars %U http://arxiv.org/abs/1403.1796 %X We show that the low ratios of $\alpha$ elements (Mg, Si, and Ca) to Fe recently found for a small fraction of extremely metal-poor stars can be naturally explained with the nucleosynthesis yields of core-collapse supernovae, i.e., $13-25M_ødot$ supernovae, or hypernovae. For the case without carbon enhancement, the ejected iron mass is normal, consistent with observed light curves and spectra of nearby supernovae. On the other hand, the carbon enhancement requires much smaller iron production, and the low $\alpha$/Fe of carbon enhanced metal-poor stars can also be reproduced with $13-25M_ødot$ faint supernovae or faint hypernovae. Iron-peak element abundances, in particular Zn abundances, are important to put further constraints on the enrichment sources from galactic archaeology surveys.

@misc{kobayashi2014origin, abstract = {We show that the low ratios of $\alpha$ elements (Mg, Si, and Ca) to Fe recently found for a small fraction of extremely metal-poor stars can be naturally explained with the nucleosynthesis yields of core-collapse supernovae, i.e., $13-25M_\odot$ supernovae, or hypernovae. For the case without carbon enhancement, the ejected iron mass is normal, consistent with observed light curves and spectra of nearby supernovae. On the other hand, the carbon enhancement requires much smaller iron production, and the low [$\alpha$/Fe] of carbon enhanced metal-poor stars can also be reproduced with $13-25M_\odot$ faint supernovae or faint hypernovae. Iron-peak element abundances, in particular Zn abundances, are important to put further constraints on the enrichment sources from galactic archaeology surveys.}, added-at = {2014-03-10T08:14:49.000+0100}, author = {Kobayashi, Chiaki and Ishigaki, Miho N. and Tominaga, Nozomu and Nomoto, Ken'ichi}, biburl = {https://www.bibsonomy.org/bibtex/2c81275e34fa6a75e42f1ac9c66b7cd34/miki}, description = {[1403.1796] The origin of low [alpha/Fe] ratios in extremely metal-poor stars}, interhash = {770a17ef5386bb8d525aee1a869afc22}, intrahash = {c81275e34fa6a75e42f1ac9c66b7cd34}, keywords = {metallicity star yields}, note = {cite arxiv:1403.1796Comment: Accepted for publication in ApJ Letter, 7 pages, 2 figures}, timestamp = {2014-03-10T08:14:49.000+0100}, title = {The origin of low [alpha/Fe] ratios in extremely metal-poor stars}, url = {http://arxiv.org/abs/1403.1796}, year = 2014 }